linux-kernel - Re: [PATCH v3 1/2] dt-bindings: timer: sifive,clint: Fix number of interrupts

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Message-ID: <CAAhSdy3g9WsBmQk7KOgdVNSw9qUouxF2i==q9M3WQq3iabXv7Q@mail.gmail.com>
Date:   Fri, 17 Dec 2021 18:18:42 +0530
From:   Anup Patel <anup@...infault.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup.patel@....com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: timer: sifive,clint: Fix number of interrupts

On Fri, Dec 17, 2021 at 6:08 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> The number of interrupts lacks an upper bound, thus assuming one,
> causing properly grouped "interrupts-extended" properties to be flagged
> as an error by "make dtbs_check".
>
> Fix this by adding the missing "maxItems".  As the architectural maximum
> is 4095 interrupts, using that as the limit would be unpractical.  Hence
> limit it to 10 interrupts (two interrupts for a system management core,
> and two interrupts per core for other cores).  This should be sufficient
> for now, and the limit can always be increased when the need arises.

Same comment as the PLIC DT binding patch.

The "maxItems" should represent CLINT spec constraints so
please don't add any synthetic value here.

Regards,
Anup



>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Acked-by: Rob Herring <robh@...nel.org>
> ---
> v3:
>   - Add Acked-by,
>
> v2:
>   - Split in two patches,
>   - Improve patch description and document limit rationale.
> ---
>  Documentation/devicetree/bindings/timer/sifive,clint.yaml | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> index 8d5f4687add9e81e..b75fd6f982b1ecb3 100644
> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -44,6 +44,7 @@ properties:
>
>    interrupts-extended:
>      minItems: 1
> +    maxItems: 10
>
>  additionalProperties: false
>
> --
> 2.25.1
>